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Synchronization – Synchroscope Interpretation. Marine Engineering Function 2 Electrical, Electronic and Control Engineering.
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Exam Scenario. During synchronization, the synchroscope rotates rapidly clockwise. What does this indicate?.
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Choices. A. Incoming generator frequency is lower B. Incoming generator frequency is higher C. Voltage is too low D. Phase sequence is incorrect.
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Correct Answer. B. Incoming generator frequency is higher.
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Key Concept. Synchroscope shows frequency difference between incoming and running generator. Direction of rotation indicates whether incoming generator is faster or slower..
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Clockwise Rotation Meaning. Clockwise rotation = Incoming generator frequency is HIGHER than busbar frequency. The generator is running faster..
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Counterclockwise Rotation. Counterclockwise rotation = Incoming generator frequency is LOWER. The generator is running slower..
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Speed vs Frequency. Generator frequency depends on speed: Higher speed → Higher frequency Lower speed → Lower frequency.
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What To Do Onboard. If rotating clockwise (too fast): - Reduce prime mover speed If rotating counterclockwise (too slow): - Increase speed Goal: Stop needle at 12 o’clock before closing breaker.
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Common Exam Trap. Clockwise = Faster Counterclockwise = Slower Do NOT confuse with voltage or phase sequence.
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Quick Recall. Clockwise = FAST Counterclockwise = SLOW.